#define _CRT_SECURE_NO_WARNINGS 1

#include<stdio.h>
int main()
{
	int h = 0, r = 0;
	scanf("%d%d", &h, &r);
	double PI = 3.14;
	int v = PI * r * r * h;
	int x = 20000 / v;
	printf("%d", x + 1);
	return 0;
}